Dr. Yingbin Xing Profile

Dr. Yingbin Xing

at Wuhan National Lab. for Optoelectronics

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Proceedings Article | 9 November 2016 Paper

63W output tandem-pumped thulium-doped silica fiber laser at 1980 nm

Ying-bin Xing, Fan Bu, Yi-bo Wang, Hai-qing Li, Jing-gang Peng, Lv-yun Yang, Neng-li Dai, Jin-yan Li

Proceedings Volume 10016, 1001618 (2016) https://doi.org/10.1117/12.2245756

KEYWORDS: Fiber lasers, Optical fibers, Thulium, Cladding, Quantum cascade lasers, Fiber Bragg gratings, Aluminum, Ions, Laser applications, Laser countermeasures

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We have demonstrated a high power and high efficiency thulium-doped silica fiber laser using a cascade tandem pumping method. A 1915nm Tm-doped fiber laser was used as a pump source for another Tm-doped fiber laser with the output power of 63W at 1980nm, corresponding to the slope efficiency of ~80%, which is the highest power to our best knowledge. And the 3dB bandwidth was 0.24nm. The 1915nm Tm-doped fiber laser was pumped by 793nm diode laser and the slope efficiency was 51%. The preform of double cladding Tm-doped fiber for the tandem pumped fiber laser was manufactured by MCVD with using the vapor-solution hybrid doping method. The fiber has a ~25μm diameter, 0.098 NA(numerical aperture) core and 400μm diameter, 0.46 NA inner cladding. In the tandem pumped fiber laser, the resonant cavity consist of a high reflection FBG at 1980nm, flat fiber end and the homemade Tm-doped silica fiber. The optimal active fiber length was presented and it is found that when the length of homemade Tm-doped silica fiber was 7m, the efficiency was the highest. The influence of Tm concentration and ratio of Tm ion and Al ion on the efficiency was also explored. And it is found that the thulium-doped silica fiber with lower Tm concentration and higher Tm:Al ratio had lower optical efficiency. Meanwhile, the optimal fiber length became shorter.

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